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<div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
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<h1>Source code for pylorax.mount</h1><div class="highlight"><pre>
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<span></span><span class="c1"># mount.py</span>
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<span class="c1">#</span>
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<span class="c1"># Copyright (C) 2011-2015 Red Hat, Inc.</span>
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<span class="c1">#</span>
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<span class="c1"># This program is free software; you can redistribute it and/or modify</span>
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<span class="c1"># it under the terms of the GNU General Public License as published by</span>
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<span class="c1"># the Free Software Foundation; either version 2 of the License, or</span>
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<span class="c1"># (at your option) any later version.</span>
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<span class="c1">#</span>
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<span class="c1"># This program is distributed in the hope that it will be useful,</span>
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<span class="c1"># but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
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<span class="c1"># MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
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<span class="c1"># GNU General Public License for more details.</span>
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<span class="c1">#</span>
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<span class="c1"># You should have received a copy of the GNU General Public License</span>
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<span class="c1"># along with this program. If not, see <http://www.gnu.org/licenses/>.</span>
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<span class="c1">#</span>
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<span class="c1"># Author(s): Brian C. Lane <bcl@redhat.com></span>
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<span class="c1">#</span>
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<span class="kn">import</span> <span class="nn">logging</span>
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<span class="n">log</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="s2">"livemedia-creator"</span><span class="p">)</span>
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<span class="kn">import</span> <span class="nn">os</span>
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<span class="kn">import</span> <span class="nn">pycdlib</span>
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<span class="kn">from</span> <span class="nn">pycdlib.pycdlibexception</span> <span class="k">import</span> <span class="n">PyCdlibException</span>
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<span class="kn">from</span> <span class="nn">pylorax.imgutils</span> <span class="k">import</span> <span class="n">mount</span><span class="p">,</span> <span class="n">umount</span>
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<div class="viewcode-block" id="IsoMountpoint"><a class="viewcode-back" href="../../pylorax.html#pylorax.mount.IsoMountpoint">[docs]</a><span class="k">class</span> <span class="nc">IsoMountpoint</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
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<span class="sd">"""</span>
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<span class="sd"> Mount the iso and check to make sure the vmlinuz and initrd.img files exist</span>
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<span class="sd"> Also check the iso for a a stage2 image and set a flag and extract the</span>
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<span class="sd"> iso's label.</span>
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<span class="sd"> stage2 can be either LiveOS/squashfs.img or images/install.img</span>
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<span class="sd"> """</span>
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<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">iso_path</span><span class="p">,</span> <span class="n">initrd_path</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
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<span class="sd">"""</span>
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<span class="sd"> Mount the iso</span>
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<span class="sd"> :param str iso_path: Path to the iso to mount</span>
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<span class="sd"> :param str initrd_path: Optional path to initrd</span>
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<span class="sd"> initrd_path can be used to point to a tree with a newer</span>
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<span class="sd"> initrd.img than the iso has. The iso is still used for stage2.</span>
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<span class="sd"> self.kernel and self.initrd point to the kernel and initrd.</span>
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<span class="sd"> self.stage2 is set to True if there is a stage2 image.</span>
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<span class="sd"> self.repo is the path to the mounted iso if there is a /repodata dir.</span>
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<span class="sd"> """</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">label</span> <span class="o">=</span> <span class="kc">None</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">iso_path</span> <span class="o">=</span> <span class="n">iso_path</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">initrd_path</span> <span class="o">=</span> <span class="n">initrd_path</span>
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<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">initrd_path</span><span class="p">:</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">mount_dir</span> <span class="o">=</span> <span class="n">mount</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">iso_path</span><span class="p">,</span> <span class="n">opts</span><span class="o">=</span><span class="s2">"loop"</span><span class="p">)</span>
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<span class="k">else</span><span class="p">:</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">mount_dir</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">initrd_path</span>
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<span class="n">kernel_list</span> <span class="o">=</span> <span class="p">[(</span><span class="s2">"/isolinux/vmlinuz"</span><span class="p">,</span> <span class="s2">"/isolinux/initrd.img"</span><span class="p">),</span>
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<span class="p">(</span><span class="s2">"/ppc/ppc64/vmlinuz"</span><span class="p">,</span> <span class="s2">"/ppc/ppc64/initrd.img"</span><span class="p">),</span>
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<span class="p">(</span><span class="s2">"/images/pxeboot/vmlinuz"</span><span class="p">,</span> <span class="s2">"/images/pxeboot/initrd.img"</span><span class="p">)]</span>
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<span class="k">if</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isdir</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">mount_dir</span><span class="o">+</span><span class="s2">"/repodata"</span><span class="p">):</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">repo</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">mount_dir</span>
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<span class="k">else</span><span class="p">:</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">repo</span> <span class="o">=</span> <span class="kc">None</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">stage2</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">exists</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">mount_dir</span><span class="o">+</span><span class="s2">"/LiveOS/squashfs.img"</span><span class="p">)</span> <span class="ow">or</span> \
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<span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">exists</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">mount_dir</span><span class="o">+</span><span class="s2">"/images/install.img"</span><span class="p">)</span>
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<span class="k">try</span><span class="p">:</span>
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<span class="k">for</span> <span class="n">kernel</span><span class="p">,</span> <span class="n">initrd</span> <span class="ow">in</span> <span class="n">kernel_list</span><span class="p">:</span>
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<span class="k">if</span> <span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isfile</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">mount_dir</span><span class="o">+</span><span class="n">kernel</span><span class="p">)</span> <span class="ow">and</span>
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<span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isfile</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">mount_dir</span><span class="o">+</span><span class="n">initrd</span><span class="p">)):</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">kernel</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">mount_dir</span><span class="o">+</span><span class="n">kernel</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">initrd</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">mount_dir</span><span class="o">+</span><span class="n">initrd</span>
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<span class="k">break</span>
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<span class="k">else</span><span class="p">:</span>
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<span class="k">raise</span> <span class="ne">Exception</span><span class="p">(</span><span class="s2">"Missing kernel and initrd file in iso, failed"</span>
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<span class="s2">" to search under: </span><span class="si">{0}</span><span class="s2">"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">kernel_list</span><span class="p">))</span>
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<span class="k">except</span><span class="p">:</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">umount</span><span class="p">()</span>
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<span class="k">raise</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">get_iso_label</span><span class="p">()</span>
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<div class="viewcode-block" id="IsoMountpoint.umount"><a class="viewcode-back" href="../../pylorax.html#pylorax.mount.IsoMountpoint.umount">[docs]</a> <span class="k">def</span> <span class="nf">umount</span><span class="p">(</span> <span class="bp">self</span> <span class="p">):</span>
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<span class="sd">"""Unmount the iso"""</span>
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<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">initrd_path</span><span class="p">:</span>
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<span class="n">umount</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">mount_dir</span><span class="p">)</span></div>
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<div class="viewcode-block" id="IsoMountpoint.get_iso_label"><a class="viewcode-back" href="../../pylorax.html#pylorax.mount.IsoMountpoint.get_iso_label">[docs]</a> <span class="k">def</span> <span class="nf">get_iso_label</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
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<span class="sd">"""</span>
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<span class="sd"> Get the iso's label using isoinfo</span>
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<span class="sd"> Sets self.label if one is found</span>
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<span class="sd"> """</span>
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<span class="k">try</span><span class="p">:</span>
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<span class="n">iso</span> <span class="o">=</span> <span class="n">pycdlib</span><span class="o">.</span><span class="n">PyCdlib</span><span class="p">()</span>
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<span class="n">iso</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">iso_path</span><span class="p">)</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">label</span> <span class="o">=</span> <span class="n">iso</span><span class="o">.</span><span class="n">pvd</span><span class="o">.</span><span class="n">volume_identifier</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="s2">"UTF-8"</span><span class="p">)</span><span class="o">.</span><span class="n">strip</span><span class="p">()</span>
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<span class="k">except</span> <span class="n">PyCdlibException</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
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<span class="n">log</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s2">"Problem reading label from </span><span class="si">%s</span><span class="s2">: </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">iso_path</span><span class="p">,</span> <span class="n">e</span><span class="p">)</span></div></div>
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